Steric Modification of a Cobalt Phthalocyanine/Graphene Catalyst To Give Enhanced and Stable Electrochemical CO2 Reduction to CO
Steric Modification of a Cobalt Phthalocyanine/Graphene Catalyst To Give Enhanced and Stable Electrochemical CO2 Reduction to CO
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DOI：
10.1021/acsenergylett.8b02355
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发表时间：
2019-03-01
影响因子：
22
通讯作者：
Officer, David L.
中科院分区：
文献类型：
--
作者：
Choi, Jaecheol;Wagner, Pawel;Officer, David L.
使用金属络合物/碳基异质化杂化物将CO2电化学转化为CO可以是高效和选择性的。分子复合物固定在碳基质上并参与产生CO2还原的电催化反应的方式并不总是很好理解。在这项工作中，一个高度可溶性和空间位阻的钴（II）八烷氧基酞菁被成功地固定在化学转化的石墨烯通过π-π堆叠。与类似的酞菁钴/石墨烯催化剂相比，烷氧基取代有助于抑制酞菁在石墨烯片上的聚集，导致单个酞菁分子的催化活性显著增强（在480 mV过电位下类似于5 s（-1）），在30 h的电解中具有稳定的CO转化率。
Electrochemical conversion of CO2 into CO using metal complex/carbon-based heterogenized hybrids can be both highly efficient and selective. The ways in which the molecular complexes are immobilized on the carbon substrates and participate in the electrocatalytic reactions that yield CO2 reduction are not always well-understood. In this work, a highly soluble and sterically hindered cobalt(II) octaalkoxyphthalocyanine was successfully immobilized on chemically converted graphene via pi-pi stacking. In comparison to an analogous cobalt phthalocyanine/graphene catalyst, the alkoxy substitutions helped to suppress the phthalocyanine aggregation on the graphene sheets, resulting in a significantly enhanced catalytic activity by a single phthalocyanine molecule (similar to 5 s(-1) at 480 mV overpotential) with stable CO conversion over 30 h of electrolysis.